Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d3360d54e6d7d6…

MALICIOUS

PDF

80.5 KB Created: 2021-07-19 00:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9955123ddbd0f361a072be37424c4bdb SHA-1: 531937025b538c09420a4ee6cbcca4ca24257fff SHA-256: 54d3360d54e6d7d6dbe48fbbe0613df865628f4c3c043e8a4b2729fb81ac7390
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress sites, suggesting an attempt to leverage these for hosting or redirecting users. The PDF structure and embedded links are consistent with techniques used to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/ca7db2dd27ff9974e08b789270630265/wifegimetufitegijavusemi.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0d518837f---duvakeserexaz.pdf
    • http://handbook.hu/upload/page/file/67023456593.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160998d8c8735f---63995740747.pdf
    • http://kashima.cc/userfiles/file/75888085276.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160774a46b2874---sofimodasezaxeweg.pdf
    • http://medicare-darmstadt.de/bilder/UserImages/file/31747949740.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92fe71e5c0---viser.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a599a2dfe---zojaguvuxotejav.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ff7987d58---xokugaxuv.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53603743ab---69603816719.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59afc1c675---56174341734.pdf
    • http://stjconsulting.it/userfiles/files/29192102723.pdf
    • http://usagimatur.com/files/others/dojudalumigata.pdf
    • https://brickbodysupplements.com/newerac2c/userfiles/file/48754972321.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847caf89c52---43353736077.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/gsfmi6acfvc7hi3hrp01d5jd8a/najora.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1e08c7729e166897ab8205dbeb68c6b2/genugujalofajuzekoj.pdf
    • http://travelshops.pl/userfiles/file/51360512339.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e42b5105ae---54980925285.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832fce523fa---26023193116.pdf
    • http://patriabrno.cz/userfiles/files/mebonifon.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077118588b11---razorajon.pdf
    • http://kompletucetnictvi.cz/files/file/86128420969.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=multiple+choice+questions+on+nutritional+assessment
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d762.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD762 16792 bytes
font_01_sfnt_off0000ef79.bin
bca834b6f7103f4f922f77de0f1813bcca1a665bf596cda8eedc77a2a79de1ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 10880 bytes
font_02_sfnt_off0001086f.bin
0a9ac1a49d97b47339ab72fb7497ec1da4ddd711846dfb99f006cc526fc9d6a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1086F 16984 bytes

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